Homebrew PCBs

Bob_xyz wrote:

> If the short etch does show signs of residue, can the board be rinsed 
> and additional developing attempted? Or is it all over at that point?
> 
> Regards, Bob

Yes, I've done that before and it seems to work a 2nd time just ok.

Note: the residue is invisible. I've seen it as an extremely thin clear 
film that peals off the copper when scrapped with a pin while viewing 
under a 40X microscope.

> 
> --- In Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@y...> 
> wrote:
> <snip>
> 
>>Rinse then, etch for 20 seconds. If copper does not 
>>turn matte pink in some areas then there this is signs of 
> 
> photoresist residue.
>